r.does "could you change a £5 note for me?" mean "exchange a £5 note for the same amount in different coins"?
yes, it does. The normal reason for this is that you need 30c for a phone call, and you only have the notes. Note, however, that some places will expect you to buy some cheap thing.
but how about i have some coins totaled £5 and ask for exchanging them for a £5 note?
that shouldn't be a problem. It depends on what the vendor's till looks like. If he's low on change, he'll welcome it.
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